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Showing 1-5 of 19 Abstracts search results

Document: 

SP75

Date: 

September 1, 1982

Author(s):

Editor: S.P. Shah

Publication:

Symposium Papers

Volume:

75

Abstract:

SP-75 The eighteen papers included in this volume report on international research into the fatigue of concrete structures. Among the topics are fatigue in structures subject to cyclic loading in offshore and Arctic environments; hydraulic fracturing effects of water; marine corrosion and fatigue strength; the validity of Miner's hypothesis; and methods of predicting crack widths and fatigue loading.

DOI:

10.14359/14127


Document: 

SP75-02

Date: 

September 1, 1982

Author(s):

A. E. Naaman

Publication:

Symposium Papers

Volume:

75

Abstract:

ified. Experimental data on the fatigue life of prestressing strands are compared with data on the fatigue life of partially prestressed beams. A close correlation results of a reliability based models of partially prestressed beams in which serviceability and ultimate strength limit states is observed. Global were considered, are presented. They strongly suggest that fatigue in the reinforcement is a controlling limit state that must be seriously accounted for in design.

DOI:

10.14359/6400


Document: 

SP75-18

Date: 

September 1, 1982

Author(s):

Knut Waagaard

Publication:

Symposium Papers

Volume:

75

Abstract:

The paper presents a short summary of the state of the art with respect to fatigue strength of reinforced and prestressed concrete structures. The simplification made in ordinary design evaluations are shortly discussed. Offshore concrete structures are exposed to an environment which is different from that compared with ordinary land structures. The special feasures of this difference will be discussed. Specially, the nature of the environmental loads causes a random load application in the structure. The paper will discuss how this may be tackled in design. Different methods used in evaluation the fatigue strength of offshore concrete structures are discussed and a proposal is made, on how to formulate a design criteria for offshore concrete structures with respect to fatigue strength evaluation.

DOI:

10.14359/6416


Document: 

SP75-11

Date: 

September 1, 1982

Author(s):

Alfred G. Bishara

Publication:

Symposium Papers

Volume:

75

Abstract:

This paper presents results from an experimental investigation in which thirteen rectangular reinforced concrete beams were subjected to cyclic loading within service conditions. One beam was designed to measure the variation in steel stress and bond stress along the beam length, particularly between cracks and in the anchorage zones near the beam ends. The variables in the other twelve beams included the area of concrete concentric with each tension rebar and the ratio of compression reinforcement to tension reinforcement. Resulting bond deterioration is analyzed and its effect on bond stress distribution as well as crack development is illustrated and discussed.

DOI:

10.14359/6409


Document: 

SP75-09

Date: 

September 1, 1982

Author(s):

Ralejs Tepfencompression; fatigue (materials); fatigue tests; plain concrete; stresses; tension.

Publication:

Symposium Papers

Volume:

75

Abstract:

The few existing tests with stress reversals between tension and compression suggest that these may have little influence on the fatigue strength of concrete. This would instead be determined by the higher of the tensile or compressive stress maxima, expressed as percentages of the appropriate static strengths, with the minimum stress equal to zero. Two series of tests were performed to gain moreinformation. The specimens used were cubes and prisms loaded with compressive loads and transverse splitting line loads. Combination of these loads and pulsation of one of them gave the desired stress reversals. The test results indicate that stress reversals cause a slight reduction in fatigue strength. This reduction may however be due to the test equipment In the Swedish Code of Practice, a reduction of design stress due to fatigue caused by stress reversals between tension and compression is required. The results obtained are on the safe side of this requirement.

DOI:

10.14359/6407


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